KR100619032B1 - Meta file transmitting method, meta file decoding method and apparatus thereof - Google Patents

Abstract

According to the present invention, a meta file transmission method, a meta file decoding method, and an apparatus are disclosed.

The meta-file transmission method according to the present invention comprises the steps of separating the actual data on the A / V data and the metadata containing the information on the actual data, and prevents different errors for the actual data and the metadata; Performing encoding and transmitting. According to the configuration of the present invention as described above, by transmitting the meta data and the actual data in the meta file and applying the error prevention encoding to the meta data, the transmission resistant to the error of the meta data can be pursued.

Description

Meta file transmission method, meta file decoding method and apparatus

1 is a reference diagram for explaining a mechanism for broadcasting a MOT object to a data carousel according to the prior art;

2 is a reference diagram for explaining a mechanism for broadcasting a MOT object to a data carousel according to the present invention;

3 is a data structure diagram in which a MOT object is transmitted according to the present invention;

4 is a structural diagram of a directory entry information field of a MOT file directory according to the present invention;

5 is a structural diagram of a metadata information field of a MOT directory according to the present invention;

6 is a reference diagram for explaining the overall flow of transmitting the meta file in accordance with the present invention,

7 is a block diagram of a MOT data decoder according to the present invention;

8 is a flowchart of a process of transmitting a meta file according to the present invention;

9 is a flowchart of a process of receiving and decoding a meta file according to the present invention.

The present invention relates to a broadcast service, and more particularly, to an MOT data decoding method and apparatus for transmitting a media meta file having a large capacity using a DMB data service.

Recently, file transfer occurs frequently through an integrated transmission network. In a broadcasting network or an internet network, services of media transmission through packets occur in an Internet service.

File Transfer Protocols in Broadcast Networks For example, the MOT protocol used in DAB will be described.

The "MOT (Multimedia Object Transfer Protocol)" refers to the transmission of multimedia objects such as text, still images, movies, and audio sequences using data channels of microwave digital radio broadcasting, and includes rules for the basic representation and manipulation of these objects. It refers to the multimedia object transfer protocol.

In general, multimedia means information or expression in various forms and formats. The multimedia materials are generally structured and packetized into containers or files, which must be delivered in the form available or in a form that meets the needs of the user before being presented.

The multimedia service requires a control function for the presentation method, and therefore, a direct access to the hardware and software resources of the terminal is required. The temporal characteristics must also be considered for proper presentation. There is a need for a synchronization function for elements such as various audio and video. In other words, a specific operating environment is required.

Objects targeted by the MOT protocol are self-contained multimedia objects such as Java, HTML, and the like, and actual files such as JPEG, ASCII text, MPEG video, or audio sequences. This protocol uses a program associated data (PAD) or packet mode data channel of microwave digital radio broadcasting for transmission of multimedia objects.

1 is a reference diagram for explaining a mechanism for broadcasting a MOT object to a data carousel according to the prior art.

The 'directory' format in the MOT protocol provides a management mechanism for broadcasting MOT objects to data carousels. The data carousel is a delivery mechanism for the application server to express a specific set of objects in the application decoder. The data carousel periodically transmits the contents of the carousel. In a data carousel, the directory provides a clear description of the carousel content, that is, the header of the object with enough information to retrieve data for each described object. If the application requires a specific entity, the receiver can look in that directory to determine:

Whether the requested object exists in the carousel

⊙ Location of the object data

If the object requested by the application is not stored in memory, the receiver can simply wait for the next broadcast.

Referring to FIG. 1, three MOT files, that is, MOT # 1 110, MOT file # 2 120, and MOT file # 3 130 are configured as one carousel 100. The MOT directory 140 is transmitted between the MOT files. The MOT directory 140 contains information about MOT files transmitted in this carousel. The receiver can decode the object of the MOT file by using the MOT directory 140 repeatedly transmitted as described above.

The MOT object consists of a header and a body connected in order, and the header consists of a header core and a header extension.

The header core has information about the size and content of the object, from which the receiver can determine whether to retain system resources necessary for decoding and representing the object. The header extension holds information for processing the object and also provides additional information that can be used for a particular application. The header extension includes any number of parameters associated with each file and the length is variable. A body can hold many kinds of data, the structure or content of which is described in Header Cores and Header Extensions.

The encoding process begins with an input of a data object to be transmitted, that is, a meta file composed of meta data and real data. The MOT encoding generates a complete MOT object including additional information in the input meta file, that is, a header core and a header extension, and the generated MOT object is an appropriately sized segment for a lower layer. ), And a segmentation header is added to each divided segment. In this way, the segment to which the segmentation header is added is converted into packets corresponding to the data group and the transmission scheme.

In a broadcasting network or an internet network, services of media transmission through packets occur in an Internet service. At this time, according to various needs of users, it is required to make the transfer of large media files faster and more convenient. As described above, the media file is composed of meta files. The structure of the meta file is meta data and actual data, and the meta data is information for the file. If this information is erroneous or sent late, users will not be able to play or store it, even if they receive the actual data. Therefore, the necessity of transmitting such meta data quickly and without error increases.

An object of the present invention is to provide a meta-file transmission method, a meta-file decoding method, and an apparatus which can make a meta-file resistant to errors and have compatibility with various transmission networks in a large-capacity media meta-file transmission.

One feature of the present invention for solving the above problems is, in the meta-file transmission method, the step of separating the actual data on the A / V data and the metadata containing the information on the actual data, And performing different error prevention encoding on the actual data and the metadata.

The transmitting may preferably include performing an advanced error prevention encoding on the meta data and a low error preventing encoding on the actual data.

Preferably, the method further includes performing data interleaving on the advanced error prevention encoded metadata.

According to another aspect of the present invention, there is provided a method for decoding a meta file, the method comprising: receiving real data related to A / V data and meta data including information related to the actual data, performing different error prevention decoding, and decoding the same; And separating the actual data and the meta data from the error prevention decoded data.

Preferably, the decoding step includes deinterleaving the received metadata.

Preferably, the decoding step includes performing advanced error prevention decoding on the metadata and performing low error prevention decoding on the actual data.

According to still another aspect of the present invention, there is provided a meta-file decoding apparatus comprising: a data decoder configured to receive actual data related to A / V data and metadata containing information related to the actual data, and perform different error prevention decoding. It is to include.

The data decoder preferably includes a deinterleaver for deinterleaving the received metadata.

The data decoding unit may include an error prevention decoding unit that performs advanced error prevention decoding on the metadata and low error prevention decoding on the actual data.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is to provide an optimal transmission effect when sending a metafile over a transmission network. With the development of transmission networks and mobile products, users are increasingly favoring wireless networks. Simple data can be easily transmitted through the wireless network, but large meta files including media have a vulnerability in the wireless network. To compensate for this, the data is divided into Meta Data and Real Data parts. Meta Data including the media player's initial job information has a requirement to be sent at the receiving end with high importance and fast and accurate. To satisfy this request, add Error Protection to Meta Data.

2 is a reference diagram for explaining a mechanism for broadcasting a MOT object to a data carousel according to an embodiment of the present invention.

Referring to FIG. 2, MOT Chunk # 1 (210), MOT Chunk # 2 (220), MOT Chunk # 3 (230), MOT Chunk # 4 (240), and MOT Chunk # 5 (composing one MOT file) 250), MOT Chunk # 6 (260) is composed of one carousel 200. The MOT file directory 270 is transmitted between MOT chunks.

MOT Chunk # 1 (210), MOT Chunk # 2 (220), MOT Chunk # 3 (230), MOT Chunk # 4 (240), MOT Chunk # 5 (250), MOT Chunk # 6 (260) Each "Chunk Unit Data" is composed by dividing a MOT file into one or more fragments. When the multimedia file to be transmitted is a large file, it is preferable to transmit one file by dividing a plurality of chunk units.

The MOT file directory 270 is MOT Chunk # 1 (210), MOT Chunk # 2 (220), MOT Chunk # 3 (230), MOT Chunk # 4 (240) and MOT Chunk # 5 ( 250) and MOT Chunk # 6 (260). In the prior art, the MOT directory contains information about a plurality of MOT files transmitted in a carousel, whereas the MOT directory according to an embodiment of the present invention contains information about one MOT file transmitted in a carousel. Referred to as "MOT file directory".

Referring to FIG. 2, according to the present invention, meta data of a meta file to be transmitted is contained in a MOT file directory 270, and actual data is contained in a MOT chunk to separate transmission of meta data and actual data. Then, different types of error prevention encoding are performed on the meta data and the actual data. Since meta data is more important information, a higher degree of error prevention encoding is performed to increase reliability, and since actual data is less important than metadata, a lower degree of error prevention encoding is performed. In addition, error prevention encoding may be performed only on meta data, and error prevention encoding may not be performed on actual data. In addition, in order to obtain the effect of distributing the error only with respect to the meta data, the data order may be alternately encoded in an interleaving manner.

3 is a data structure diagram in which a MOT object is transmitted according to the present invention.

Referring to FIG. 3, the large-capacity MOT file 300 is composed of meta data and actual data. According to the present invention, the actual data of the MOT file 300 is divided into a plurality of pieces. In FIG. 3 the actual data was divided into six pieces. Thus, the MOT file 300 includes metadata 442, Chunk 1 214, Chunk 2 224, Chunk 3 234, Chunk 4 244, Chunk 5 254, and Chunk 6 264. It consists of.

When the MOT file is transmitted to the carousel, the metadata 442 is contained in the MOT file directory 400 and transmitted. This metadata 442 includes Chunk information. Therefore, the metadata portion of the MOT file is included in the MOT file directory and repeatedly transmitted according to the MOT protocol transmission method. Error prevention encoding and data interleaving may be performed on the MOT file directory containing such metadata.

Each chunk unit data Chunk 1 (214), Chunk 2 (224), Chunk 3 (234), Chunk 4 (244), Chunk 5 (254), and Chunk 6 (264) respectively contain header information for the chunk unit data. It is attached and sent in a MOT chunk.

MOT Chunk # 1 210 is composed of Header Core 211, Header Extension 212, Chunk 1 data (214). In particular, the Header Extension 212 includes a ChunkIndex 213, which is inserted to indicate which Chunk data that follows is the location in this MOT file, that is, the number of chunks in this MOT file. The chunk index information enables the receiver to access data in chunk units, thereby improving decoding efficiency. Through this chunk information, in the MOT Carousel part of the receiver, the partly received information quickly informs the position in the whole file.

In this way, the actual data part of the MOT file is divided into chunk units, included in the body part of the general object structure, transmitted, and the ChunkIndex parameter is specified in the header extension so that the receiver can be notified of the location in the file. The reason for following this approach is that the metadata is received faster than the entire actual data, so that the receiving party can not only prepare the processing for the actual data in advance, but also use the partially received real data to immediately render as much data as received from the users. Because it can. The receiver uses ChunkIndex to construct the completed file using MOT Carousel. When the file is divided into chunks and transmitted, the receiving end can render from the middle of the file. In addition, when data is lost or there is an error, the receiving end can save processing time because only the detected chunk part is received without receiving the first data. Since the file is transmitted in this manner, the process of reconstructing the media data into packets can be omitted, and the recording can be performed while playing in real time without including a file storage system (recording system) device at the receiving end.

4 is a structural diagram of a MOT file directory 400 according to the present invention.

Referring to FIG. 4, the MOT file directory 400 includes a directory header 410 and a directory body 420.

Directory header 410 carries additional information such as the number of objects described by this directory.

The directory body 420 is composed of directory entry information 430 and metadata information 440.

The directory entry information 430 is a list of information contained in this carousel, that is, information about each chunk, and includes directory entry # 1 510, directory entry # 2 520, directory entry # 3 530, Directory entry # 4 (540), directory entry # 5 (550), and directory entry # 6 (560).

Each directory entry consists of a TransportId and a MOT header.

For example, directory entry # 1 510 is composed of chunk # 1 TransportId 511 and Chunk # 1 MOT header 512. chunk # 1 TransportId 511 is a unique ID used to identify Chunk # 1 when transmitting Chunk # 1, and the Chunk # 1 MOT header 512 indicates header information about Chunk # 1. Header Core and Header Extension added to each chunk unit data.

5 is a structural diagram of a metadata information field of a MOT directory according to the present invention.

Referring to FIG. 5, the metadata information 440 includes a metadata length field 441 indicating the length of metadata of the MOT file sent to the carousel, and the metadata 442.

6 is a reference diagram for explaining the overall flow of transmitting the meta file in accordance with the present invention.

First, the transmitting side will be described.

In the session layer, the meta format file is encapsulated by separating the metadata from the actual data. In the session layer, the process of encapsulating metadata and actual data is configured for the corresponding transport network. In FIG. 6, since the file transfer uses the MOT protocol in the DAB data service, meta data is encapsulated in the MOT directory and actual data is encapsulated in the MOT. In this case, the actual data is divided into chunk units, and a MOT object is created using each chunk unit data. That is, when transmitting a meta file, an error protection code is added to the meta data at the session layer regardless of the transport network. FIG. 6 illustrates an example of applying DAB data service by attaching a ReedSolomon code in an MOT directory portion in which meta data is encapsulated and interleaving. On the other hand, since the actual data is less important at the receiving end than the metadata and is to be received quickly, the error prevention encoding is not performed. Reed Soloman coding is applied to error correction of block codes and has a large degree of freedom in signal construction. Interleaving is a method of intersecting the order of data and has an effect of distributing errors. However, such ReedSolomon coding and interleaving are one of the methods of error-proof coding, and other error-proof coding may be applied.

The information on the Error Protection may be transmitted by FIC in DAB which plays a role as a predecessor, SDP in streaming, or preset in the transmitter and receiver, but it does not matter here. However, since Real Data has a lot of data, is of low importance, and needs to be transmitted in real time to the receiving end, it may be appropriate not to apply Error Protection. Error protection at the session layer is very useful in wireless or poor reception areas where there are many errors in the transmission network. Such meta data can be immediately received by users who access the broadcasting network randomly through repetitive transmission, and can receive meta data accurately and quickly through error detection and correction even in an error-rich environment. Received Meta Data can play Real Data in real time when information is interpreted through media player, and can save file quickly.

According to the present invention, it is possible to provide a file transmission service safely and quickly for various transmission networks and error-free wireless environments by varying error protection according to the importance of information and real-time reception constraints when transmitting a file.

In the transport layer, the MOT file directory and the MOT object thus constructed are divided into predetermined units, and header information is added to the divided data to form a data group.

In the network layer, data of such a data group is made into packets of predetermined units, and DAB multiplexed and sent to the broadcasting network.

On the receiving side, DAB demultiplexes the data received from the broadcasting network at the network layer, forms each packet data, and sends the packet data to the transport layer.

The transport layer uses the packet data to obtain data group data, and transmits the data group data to the session layer.

In the session layer, the metadata portion of the received data group data is deinterleaved to obtain the metadata portion and the actual data. Reed Solomon decoding is performed on the meta data. In this manner, the meta data and the chunk data are extracted, and actual data is obtained from the chunk data.

7 is a block diagram of a MOT data decoder according to the present invention.

Referring to FIG. 7, MOT data transmitted from the transmitting side 701 is received by the MOT data decoder 700 through the broadcasting network 702, and the MOT data decoder 700 transmits the data to the A / V reproducing unit 703. To be played.

Indeed, the data received from the broadcast network 702 is received by the MOT data decoder 700 through various stages of interface, although not shown.

The MOT data decoder 700 includes a deinterleaver 710, an error prevention decoder 720, a MOT carousel 730, a metadata reader 740, and an actual data storage unit 750.

The deinterleaver 710 obtains meta data by performing deinterleaving on the metadata related part among the received data.

The error prevention decoding unit 720 performs error prevention decoding on the deinterleaved metadata.

The MOT carousel 730 stores data consisting of a MOT object consisting of actual data and a MOT file directory including metadata output from the error prevention decoding unit 720.

The meta data, the MOT directory, and the MOT file directory among the data stored in the MOT carousel 730 are sent to the metadata reader 740, and the actual data is stored in the actual data storage 750.

The metadata reader 740 reads and decodes the actual data stored in the actual data storage 750 by referring to the received metadata and transmits the decoded data to the A / V playback unit 703.

That is, the metadata reader 740 receives the metadata, and the chunk unit data in which the MOT file is divided into one or more pieces is stored in the actual data storage unit 750. The meta data reader 740 decodes the chunk data stored in the actual data storage unit 750 using the meta data. The metadata contains information about each chunk data, and since the chunk data stored in the actual data storage unit 750 also has the chunk index, the metadata reader 740 can render even from the middle of the file.

8 is a flowchart of a process of transmitting a meta file according to the present invention.

Referring to FIG. 8, the meta format file is divided into meta data and actual data (step 810).

Then, the metadata and the actual data are classified and encapsulated (step 820).

Next, in case of meta data, Reed Solomon encoding and data interleaving are performed (step 840), and transmitted to the transport layer and the network layer (step 850). (Step 850).

As described above, other methods may be used for the error protection encoding on the metadata, and high error protection encoding may be applied to the metadata and low error protection encoding may be applied to the actual data.

9 is a flowchart illustrating a process of receiving and decoding a meta file according to the present invention.

Referring to FIG. 9, data is received from a network layer and a transport layer (step 910).

In the case of meta data (step 920), deinterleaving is performed and Reed Solomon decoding is performed (step 930). The real data proceeds to step 940 without additional error prevention decoding, and session layer processing is performed on the real data and the meta data (step 940).

Next, the process restores the meta file (step 950).

The decoding method as described above can also be embodied as computer readable codes on a computer readable recording medium. Computer-readable recording media include all types of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the decoding method can be easily inferred by programmers in the art to which the present invention belongs.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

 According to the configuration of the present invention as described above, by separating the meta data and the actual data in the meta file and applying the error-proof encoding to the meta data, the transmission of the error resistant to the meta data is pursued. In addition, because the meta files are transmitted accurately, file storage and media playback can be executed more quickly, and file transfer can accelerate the real-time play. In addition, according to the present invention has a compatibility for a variety of transmission networks, in particular can bring a lot of effects in a wireless environment with a lot of errors.

Claims (9)

In the meta file transfer method, Separating the actual data on the A / V data and the metadata containing the information on the actual data; And transmitting and performing different error prevention encoding on the actual data and the meta data. The method of claim 1, The transmitting step, And performing an advanced error prevention encoding on the metadata and a low error preventing encoding on the actual data. The method of claim 2, And performing data interleaving on the advanced error-protected encoded metadata. In the meta-file decoding method, Receiving real data about A / V data and meta data containing information about the actual data, and performing decoding to perform different error prevention decoding; And separating the actual data and the meta data from the error-protected decoded data. The method of claim 4, wherein The decoding step, And deinterleaving the received meta data. The method of claim 4, wherein The decoding step, And performing advanced error prevention decoding on the metadata and performing low error protection decoding on the actual data. In the meta-file decoding device, And a data decoder configured to receive actual data on A / V data and metadata containing information on the actual data and perform different error prevention decoding. The method of claim 7, wherein The data decoder is, And a deinterleaver for deinterleaving the received metadata. The method of claim 7, wherein The data decoder is, And an error prevention decoding unit configured to perform advanced error prevention decoding on the metadata and low error prevention decoding on the actual data.

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